Automatic stop for phonographs.



F. W. WASCHAU.

AU TOMAT IC STOP FOR PHONOGRAPHS. APPLICATION FILED APR, 3. 19l8.

1,293,268. Patented Feb. 4, 1919.

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srn 'rns PATENT OFFTQE.

- '1. FREDERICK w. wAsoHA or KANSAS CITY, MISSOURI.

streams s'ror For. PHONOGRAPHS.

To all whamttma comer/m L" 7 Be it know ir-tha't'L FREDERICK W. WA- SCHAU, a citizen-ofthe United States, residing at Kansas City, in the county of Jackson and State of Missouri, h ve invented certain new and useful Improvements in Automatic Stops for Pho1iegrap1ts,0t which thefollowing is a specification,

My invention restate automatic et s for phonographs employing disk recor's, and my object is to protect such disks from injury after the completion of a piece.

The device is adjustable to accommodate records having a greater or less number of convolutions on their upper surface, and consists of the parts hereinafter described and claimed.

In order that the invention may be fully understood, reference will now be made to the accompanying drawing, in which:

Figure 1 is a plan view of the device in operative position.

Fig. 2 is a side elevation partly in section of the device in position upon the center post of a phonograph.

Fig. 3 is a cross section on line III-III of Fig. 2 of a tubular clamp employed in carrying out the invention. p

Fig. 4 is a plan view of an arm and a pi'votal member thereon forming important features of the invention.

Fig. 5 is a detail side elevation of a member for contacting with the pivotal member on the arm to stop the phonograph turntable, when the needle reaches the inner terminal of the last convolution on the record.

A, designates a record and B the turntable of a phonograph, fixed to the customary center post G which extends above the upper surface of the turntable B, to center the records thereon.

1 designates a tubular clamp, the lower portion of which has vertical slots 2, to render it resilient so that it may grip the upper end of the center post C, and rotate therewith. The clamp 1 has a closed upper end a through which a set screw 6 is threaded to firmly engage and hold the arm 7 in openings 9 and 10, at opposite sides of said clamp 1. The forward portion 11 of the arm 7 extends downwardly close to the top of the record A, and its bifurcated terminal 15 is provided with a pivotal member 14, having forwardly-diverging trip and stop fingers 17 and 18, respectively, and rear- Specification of Letters Patent.

Patented Feb. a, 1919.

'iipp'nca'titn siei Apri13, 191's. sesame. 226,353.

wardly-diverging stops 19 and 20 to limit the pivotal movement of said member 14.

22 designates a sleeve 'removably-secured upon the lower end of the needle holder F by the usual set screw G, which secures the needle H in said needle holderF. The sleeve 22 has a depending Contact member 25, against which the fingers 17 and 18 successively impinge as will hereinafter appear.

The bottom of the opening 9 in the clamp 1 is slightly higher than the bottom of the opening 10. Hence, when a long needleis employed that raises'the contact member 25 some distance above the record D, the outer end of the arm 7 is raised accordingly to bring the member 14 on a level with said member 25, by turning the clamp l to bring the opening 9 next to said member 25, and when a short needle is used the outer end of the arm 7 is lowered as disclosed by dotted lines, Fig. 2, by removing said arm 7 and turning the clamp 1 a half revolution to bring the opening 10 next to the member 25, after which the arm 7 is replaced in the clamp 1. V

In practice, after a record has been placed upon the turntable B in the usual manner. the tubular clamp member 1 is slipped downwardly upon the upper end of the post C, which it grips sufliciently to rotate therewith. The arm 7 is then adjusted longitudinally to bring the trip finger 17 over the last couple of convolutions K on the record A, as disclosed by full lines, Fig. 1. Then as the turntable and the record revolve and the needle H is carried inwardly toward the inner terminal of the convolutions K, the trip finger 17 impinge against the contact member 25 and is swung backwardly to the dotted line position, Fig. 1. This movement throws the finger 18 in position to squarely engage the contact member 25 on the next revolution of the turntable B, which is thereby checked and the needle H is prevented from jumping and injuring the rec- 0rd.

From the foregoing description, it is apparent that I have produced a simple device whereby phonograph turntable may be stopped as the needle reaches the inner end of the convolutions on the record, and while I'have shown and described the preferred form of my invention, I reserve the right to make such changes in the construction, combination, and arrangement of parts as properly fall within the spirit and scope of the claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

1. In a device of the character described, an arm, a support therefor for engagement over the center post of a phonograph, and a member pivoted to swing in a horizontal plane on the arm comprising diverging trip and stop fingers and tWo rearwardly-diverging stops for engagement with opposite sides of the arm, substantially as described.

2. In a device of the character described,

-' a resilient tubular clamp for engagement over the center post of a phonograph and having two diametrically-opposed openings the bottom of one opening being slightly higher than the bottom of the opposing opening, an arm adapted to fit in the openings in said clamp and have its free end adjusted vertically by the bottoms of said openings, means carried by the clamp for firmly holding the arm in the openings, and a member operably-mounted upon one end of the arm andadapted to be checked by contacting means on the phonograph.

In testimony whereof I afiix my signature; in the presence of two Witnesses.

' FREDERICK W. WASCHAU.

Witnesses:

F. G. FISCHER, L. J. FISCHER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

